Yes. Gender and sex are distinct concepts.
And if the people who believe that Gender is something more than just sexist stereotypes had picked different words to the ones we already used for sex we'd not be having this conversation at all, and all the arguments about sex amd Gender wouldn't ever have happened.
But they didn't.
They, while claiming on the one hand that gender is different to sex, nevertheless with the other grabbed right on to sex and created the unfounded and unevidenced claim that gender is not in fact different to sex but is somehow a newer better version of sex that can replace sex in society, in privacy, in language and in how we relate to and understand each other, to the degree we don't need to think about, respect or even name sex at all.
And that is why Genderism is sexist. Because in using the words that came from sex, it is claiming that there is a connection between the-idea-in-a-man's-head-that-makes-him-a-woman and people who are physically female.
And who does society giving credence tp the idea that being a "woman" is about how you think not the reality of living as a female bodied person hurt most?
Not men, because thanks to Patriarchy the world is already set up for them.
No, it affects women, because Patriarchy is not set up for us and so we need to be able to explain and understand how our experiences and needs are different to men in order to escape it.
So please, next time you blithely parrot that sex and gender are different, stop and ask yourself why, if they are different, is it so important that the language of sex - the pronouns, the names, the words Woman and female, Man and male, have to be the same?